The DNREC State Energy Office (SEO) supports the adoption and implementation of energy conservation codes that help make buildings across Delaware more comfortable, affordable and energy efficient.

Regularly updating building standards for new residential and commercial construction as well as working with builders, code officials and other stakeholders to facilitate implementation are essential for lowering utility costs and supporting the state’s climate and energy goals.

Building energy codes set standards for new residential and commercial construction. The State Energy Office adopts updated versions of the International Energy Conservation Code (IECC) for residential buildings and the American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE) for commercial and high-rise residential buildings.

Regular Reviews and Updates

Delaware state law (16 Del. C. §7602) requires the SEO to conduct a review of Delaware’s energy code every three years. The SEO reviews model code changes, engages with stakeholders and adheres to a regulatory development process to promulgate amended versions of the Regulations for State Energy Conservation Code (7 DE Admin. Code 2101).

In April, 2026, DNREC promulgated revisions to the regulations to adopt the latest versions of the IECC and ASHRAE with zero net energy capable amendments. Find more information about this update in the April 2026 edition of the Delaware Register of Regulations.

Technical Assistance and Training

The SEO provides technical assistance and training materials to facilitate implementation and compliance. Technical support is available via telephone (1-877-494-1333) and by email at EnergyCodesDE@psdconsulting.com. The hotline is open for questions regarding the most recently adopted residential or commercial codes. Training is developed to assist builders and code officials with transitioning to Delaware’s updated code. 

Regularly updating Delaware’s energy conservation codes reduces energy use, supports utility savings, lowers greenhouse gas emissions and promotes safe, comfortable and resilient buildings.